32
ECC-50/125DA Instruction Manual —
P/N LS10027-000FL-E:D 5/21/2015
ECC-50BDA Backup Remote Amplifier
Installation
Class A (Style Z)
Figure 3.6 illustrates how to wire speakers to the control panel using Class A (Style Z) wiring.
Audio Riser Wiring
The Audio Riser is an analog voice bus that carries the recorded voice messages from the ECC dis-
play board to the ECC-50BDAs, or the voice messages generated from a system microphone to the
ECC-50BDAs. The maximum resistance on the audio riser is 20
Ω
. The ECC-50BDA supports two
audio riser channels. The wiring method is the same for both channels. Audio Riser 1 and Audio
Riser 2 should never be wired together.
Connect the Audio Riser from TB22 on the main control board to the ECC-50BDAs as shown in
Figure 3.7.
TB4
B A + -
+ -
+ - + - + - + -
+ - + - + - + -
OUT
IN
OUT
IN
TB6
TB5
TB2
Figure 3.6 Class A (Style Z) Speaker Configuration
Supervised,
Power-limited
du
al_
a
.w
mf
TB3
TB3
-OUT+ - IN+
-OUT+ - IN+
SW1
SW1
SW2
SW2
Figure 3.7 Audio Riser Wiring
ECC-50BDA
ECC-50BDA
To next
ECC-
50BDA
ECC-50/100
main control board
Supervised,
Power-limited
UL-listed 15K
Ω
ELR at last panel
on Audio Riser
dua
laud
iow
ire.w
m
f
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